[游戏开发]Unity打开文件浏览器选择视频、图片及打开文件

1.需要一个基本脚本OpenFileName.cs

using System;
using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public class OpenFileName
{
    public int structSize = 0;
    public IntPtr dlgOwner = IntPtr.Zero;
    public IntPtr instance = IntPtr.Zero;
    public String filter = null;
    public String customFilter = null;
    public int maxCustFilter = 0;
    public int filterIndex = 0;
    public String file = null;
    public int maxFile = 0;
    public String fileTitle = null;
    public int maxFileTitle = 0;
    public String initialDir = null;
    public String title = null;
    public int flags = 0;
    public short fileOffset = 0;
    public short fileExtension = 0;
    public String defExt = null;
    public IntPtr custData = IntPtr.Zero;
    public IntPtr hook = IntPtr.Zero;
    public String templateName = null;
    public IntPtr reservedPtr = IntPtr.Zero;
    public int reservedInt = 0;
    public int flagsEx = 0;
}

public class WindowDll
{
    [DllImport("Comdlg32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
    public static extern bool GetOpenFileName([In, Out] OpenFileName ofn);
    public static bool GetOpenFileName1([In, Out] OpenFileName ofn)
    {
        return GetOpenFileName(ofn);
    }
}

2.获取文件目录的视频，播放

using UnityEngine;
using UnityEngine.Video;
using System.Runtime.InteropServices;
public class VideoControl : MonoBehaviour
{
    VideoPlayer vp;
    private void Start()
    {
        vp = transform.GetComponent<VideoPlayer>();
    }
    public void SetVideoByFile()
    {
        vp.Pause();
        OpenFileName ofn = new OpenFileName();
        ofn.structSize = Marshal.SizeOf(ofn);
        ofn.filter = "All Files\0*.*\0\0";
        ofn.file = new string(new char[256]);
        ofn.maxFile = ofn.file.Length;
        ofn.fileTitle = new string(new char[64]);
        ofn.maxFileTitle = ofn.fileTitle.Length;
        string path = Application.streamingAssetsPath;
        path = path.Replace('/', '\\');
        ofn.initialDir = path;
        ofn.title = "Open Project";
        ofn.defExt = "JPG";
        //注意 一下项目不一定要全选 但是0x00000008项不要缺少  
        ofn.flags = 0x00080000 | 0x00001000 | 0x00000800 | 0x00000200 | 0x00000008;//OFN_EXPLORER|OFN_FILEMUSTEXIST|OFN_PATHMUSTEXIST| OFN_ALLOWMULTISELECT|OFN_NOCHANGEDIR  
        if (WindowDll.GetOpenFileName(ofn))
        {
            Debug.Log("Selected file with full path: {0}" + ofn.file);
        }
        vp.url = ofn.file;
        vp.Play();
    }
}

3.获取文件目录的图片，显示

using System;
using UnityEngine;
using UnityEngine.UI;
using System.Collections;
using System.Runtime.InteropServices;
using UnityEngine.Networking;

public class TextureControl : MonoBehaviour
{
    RawImage img;
    public void SetTextureByFile()
    {
        img = transform.GetComponent<RawImage>();
        OpenFileName ofn = new OpenFileName();
        ofn.structSize = Marshal.SizeOf(ofn);
        ofn.filter = "All Files\0*.*\0\0";
        ofn.file = new string(new char[256]);
        ofn.maxFile = ofn.file.Length;
        ofn.fileTitle = new string(new char[64]);
        ofn.maxFileTitle = ofn.fileTitle.Length;
        string path = Application.streamingAssetsPath;
        path = path.Replace('/', '\\');
        ofn.initialDir = path;
        ofn.title = "Open Project";
        ofn.defExt = "JPG";
        //注意 一下项目不一定要全选 但是0x00000008项不要缺少  
        ofn.flags = 0x00080000 | 0x00001000 | 0x00000800 | 0x00000200 | 0x00000008;//OFN_EXPLORER|OFN_FILEMUSTEXIST|OFN_PATHMUSTEXIST| OFN_ALLOWMULTISELECT|OFN_NOCHANGEDIR  
        if (WindowDll.GetOpenFileName(ofn))
        {
            Debug.Log("Selected file with full path: {0}" + ofn.file);
        }
        if (ofn.file != "")
        {
            StartCoroutine(GetTexture(ofn.file, (tx) =>
            {
                img.texture = tx;
            }));
        }
    }
    IEnumerator GetTexture(string path, Action<Texture> callback)
    {
        UnityWebRequest uwr = new UnityWebRequest(path);
        DownloadHandlerTexture dht = new DownloadHandlerTexture(true);
        uwr.downloadHandler = dht;
        yield return uwr.SendWebRequest();
        if (!uwr.isNetworkError)
        {
            callback(dht.texture);
        }
    }
}

4.获取文件目录的文件，打开文件

using UnityEngine;
using System.Runtime.InteropServices;

public class OpenFile : MonoBehaviour
{
    public void OpenFiles()
    {
        OpenFileName ofn = new OpenFileName();
        ofn.structSize = Marshal.SizeOf(ofn);
        ofn.filter = "All Files\0*.*\0\0";
        ofn.file = new string(new char[256]);
        ofn.maxFile = ofn.file.Length;
        ofn.fileTitle = new string(new char[64]);
        ofn.maxFileTitle = ofn.fileTitle.Length;
        string path = Application.streamingAssetsPath;
        path = path.Replace('/', '\\');
        ofn.initialDir = path;
        ofn.title = "Open Project";
        ofn.defExt = "JPG";
        //注意 一下项目不一定要全选 但是0x00000008项不要缺少  
        ofn.flags = 0x00080000 | 0x00001000 | 0x00000800 | 0x00000200 | 0x00000008;//OFN_EXPLORER|OFN_FILEMUSTEXIST|OFN_PATHMUSTEXIST| OFN_ALLOWMULTISELECT|OFN_NOCHANGEDIR  
        if (WindowDll.GetOpenFileName(ofn))
        {
            Debug.Log("Selected file with full path: {0}" + ofn.file);
        }
        if (ofn.file != "")
        {
            Application.OpenURL(ofn.file);
        }
    }
}